diff --git a/src-tauri/src/commands/config.rs b/src-tauri/src/commands/config.rs
index c66798d..7e1f244 100644
--- a/src-tauri/src/commands/config.rs
+++ b/src-tauri/src/commands/config.rs
@@ -73,9 +73,10 @@ pub async fn open_config_folder(handle: AppHandle, app: String) -> Result<bool,
 #[tauri::command]
 pub async fn pick_directory(
     app: AppHandle,
-    default_path: Option<String>,
+    #[allow(non_snake_case)]
+    defaultPath: Option<String>,
 ) -> Result<Option<String>, String> {
-    let initial = default_path
+    let initial = defaultPath
         .map(|p| p.trim().to_string())
         .filter(|p| !p.is_empty());
 
diff --git a/src-tauri/src/commands/import_export.rs b/src-tauri/src/commands/import_export.rs
index f0070ef..7fb8ad3 100644
--- a/src-tauri/src/commands/import_export.rs
+++ b/src-tauri/src/commands/import_export.rs
@@ -11,14 +11,17 @@ use crate::store::AppState;
 
 /// 导出配置文件
 #[tauri::command]
-pub async fn export_config_to_file(file_path: String) -> Result<Value, String> {
+pub async fn export_config_to_file(
+    #[allow(non_snake_case)]
+    filePath: String
+) -> Result<Value, String> {
     tauri::async_runtime::spawn_blocking(move || {
-        let target_path = PathBuf::from(&file_path);
+        let target_path = PathBuf::from(&filePath);
         ConfigService::export_config_to_path(&target_path)?;
         Ok::<_, AppError>(json!({
             "success": true,
             "message": "Configuration exported successfully",
-            "filePath": file_path
+            "filePath": filePath
         }))
     })
     .await
@@ -29,11 +32,12 @@ pub async fn export_config_to_file(file_path: String) -> Result<Value, String> {
 /// 从文件导入配置
 #[tauri::command]
 pub async fn import_config_from_file(
-    file_path: String,
+    #[allow(non_snake_case)]
+    filePath: String,
     state: State<'_, AppState>,
 ) -> Result<Value, String> {
     let (new_config, backup_id) = tauri::async_runtime::spawn_blocking(move || {
-        let path_buf = PathBuf::from(&file_path);
+        let path_buf = PathBuf::from(&filePath);
         ConfigService::load_config_for_import(&path_buf)
     })
     .await
@@ -77,13 +81,14 @@ pub async fn sync_current_providers_live(state: State<'_, AppState>) -> Result<V
 #[tauri::command]
 pub async fn save_file_dialog<R: tauri::Runtime>(
     app: tauri::AppHandle<R>,
-    default_name: String,
+    #[allow(non_snake_case)]
+    defaultName: String,
 ) -> Result<Option<String>, String> {
     let dialog = app.dialog();
     let result = dialog
         .file()
         .add_filter("JSON", &["json"])
-        .set_file_name(&default_name)
+        .set_file_name(&defaultName)
         .blocking_save_file();
 
     Ok(result.map(|p| p.to_string()))
diff --git a/src-tauri/src/commands/provider.rs b/src-tauri/src/commands/provider.rs
index 23daba9..e158792 100644
--- a/src-tauri/src/commands/provider.rs
+++ b/src-tauri/src/commands/provider.rs
@@ -116,12 +116,12 @@ pub fn import_default_config(state: State<'_, AppState>, app: String) -> Result<
 #[tauri::command]
 pub async fn query_provider_usage(
     state: State<'_, AppState>,
-    provider_id: Option<String>,
+    #[allow(non_snake_case)]
+    providerId: String,  // 使用 camelCase 匹配前端
     app: String,
 ) -> Result<crate::provider::UsageResult, String> {
-    let provider_id = provider_id.ok_or_else(|| missing_param("providerId"))?;
     let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    ProviderService::query_usage(state.inner(), app_type, &provider_id)
+    ProviderService::query_usage(state.inner(), app_type, &providerId)
         .await
         .map_err(|e| e.to_string())
 }
@@ -137,9 +137,10 @@ pub fn read_live_provider_settings(app: String) -> Result<serde_json::Value, Str
 #[tauri::command]
 pub async fn test_api_endpoints(
     urls: Vec<String>,
-    timeout_secs: Option<u64>,
+    #[allow(non_snake_case)]
+    timeoutSecs: Option<u64>,
 ) -> Result<Vec<EndpointLatency>, String> {
-    SpeedtestService::test_endpoints(urls, timeout_secs)
+    SpeedtestService::test_endpoints(urls, timeoutSecs)
         .await
         .map_err(|e| e.to_string())
 }
@@ -149,11 +150,11 @@ pub async fn test_api_endpoints(
 pub fn get_custom_endpoints(
     state: State<'_, AppState>,
     app: String,
-    provider_id: Option<String>,
+    #[allow(non_snake_case)]
+    providerId: String,
 ) -> Result<Vec<crate::settings::CustomEndpoint>, String> {
     let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    let provider_id = provider_id.ok_or_else(|| missing_param("providerId"))?;
-    ProviderService::get_custom_endpoints(state.inner(), app_type, &provider_id)
+    ProviderService::get_custom_endpoints(state.inner(), app_type, &providerId)
         .map_err(|e| e.to_string())
 }
 
@@ -162,12 +163,12 @@ pub fn get_custom_endpoints(
 pub fn add_custom_endpoint(
     state: State<'_, AppState>,
     app: String,
-    provider_id: Option<String>,
+    #[allow(non_snake_case)]
+    providerId: String,
     url: String,
 ) -> Result<(), String> {
     let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    let provider_id = provider_id.ok_or_else(|| missing_param("providerId"))?;
-    ProviderService::add_custom_endpoint(state.inner(), app_type, &provider_id, url)
+    ProviderService::add_custom_endpoint(state.inner(), app_type, &providerId, url)
         .map_err(|e| e.to_string())
 }
 
@@ -176,12 +177,12 @@ pub fn add_custom_endpoint(
 pub fn remove_custom_endpoint(
     state: State<'_, AppState>,
     app: String,
-    provider_id: Option<String>,
+    #[allow(non_snake_case)]
+    providerId: String,
     url: String,
 ) -> Result<(), String> {
     let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    let provider_id = provider_id.ok_or_else(|| missing_param("providerId"))?;
-    ProviderService::remove_custom_endpoint(state.inner(), app_type, &provider_id, url)
+    ProviderService::remove_custom_endpoint(state.inner(), app_type, &providerId, url)
         .map_err(|e| e.to_string())
 }
 
@@ -190,12 +191,12 @@ pub fn remove_custom_endpoint(
 pub fn update_endpoint_last_used(
     state: State<'_, AppState>,
     app: String,
-    provider_id: Option<String>,
+    #[allow(non_snake_case)]
+    providerId: String,
     url: String,
 ) -> Result<(), String> {
     let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    let provider_id = provider_id.ok_or_else(|| missing_param("providerId"))?;
-    ProviderService::update_endpoint_last_used(state.inner(), app_type, &provider_id, url)
+    ProviderService::update_endpoint_last_used(state.inner(), app_type, &providerId, url)
         .map_err(|e| e.to_string())
 }
 
diff --git a/src/lib/api/settings.ts b/src/lib/api/settings.ts
index 5e30ec6..dc5874a 100644
--- a/src/lib/api/settings.ts
+++ b/src/lib/api/settings.ts
@@ -39,7 +39,7 @@ export const settingsApi = {
   },
 
   async selectConfigDirectory(defaultPath?: string): Promise<string | null> {
-    return await invoke("pick_directory", { default_path: defaultPath });
+    return await invoke("pick_directory", { defaultPath });
   },
 
   async getClaudeCodeConfigPath(): Promise<string> {
@@ -70,10 +70,7 @@ export const settingsApi = {
   },
 
   async saveFileDialog(defaultName: string): Promise<string | null> {
-    return await invoke("save_file_dialog", {
-      default_name: defaultName,
-      defaultName,
-    });
+    return await invoke("save_file_dialog", { defaultName });
   },
 
   async openFileDialog(): Promise<string | null> {
@@ -81,17 +78,11 @@ export const settingsApi = {
   },
 
   async exportConfigToFile(filePath: string): Promise<ConfigTransferResult> {
-    return await invoke("export_config_to_file", {
-      file_path: filePath,
-      filePath,
-    });
+    return await invoke("export_config_to_file", { filePath });
   },
 
   async importConfigFromFile(filePath: string): Promise<ConfigTransferResult> {
-    return await invoke("import_config_from_file", {
-      file_path: filePath,
-      filePath,
-    });
+    return await invoke("import_config_from_file", { filePath });
   },
 
   async syncCurrentProvidersLive(): Promise<void> {
diff --git a/src/lib/api/usage.ts b/src/lib/api/usage.ts
index badc88c..eb08730 100644
--- a/src/lib/api/usage.ts
+++ b/src/lib/api/usage.ts
@@ -7,7 +7,7 @@ export const usageApi = {
   async query(providerId: string, appId: AppId): Promise<UsageResult> {
     try {
       return await invoke("query_provider_usage", {
-        provider_id: providerId,
+        providerId: providerId,
         app: appId,
       });
     } catch (error: unknown) {
diff --git a/src/lib/api/vscode.ts b/src/lib/api/vscode.ts
index 124c05e..4da38f5 100644
--- a/src/lib/api/vscode.ts
+++ b/src/lib/api/vscode.ts
@@ -20,7 +20,7 @@ export const vscodeApi = {
   ): Promise<EndpointLatencyResult[]> {
     return await invoke("test_api_endpoints", {
       urls,
-      timeout_secs: options?.timeoutSecs,
+      timeoutSecs: options?.timeoutSecs,
     });
   },
 
@@ -30,7 +30,7 @@ export const vscodeApi = {
   ): Promise<CustomEndpoint[]> {
     return await invoke("get_custom_endpoints", {
       app: appId,
-      provider_id: providerId,
+      providerId: providerId,
     });
   },
 
@@ -41,7 +41,7 @@ export const vscodeApi = {
   ): Promise<void> {
     await invoke("add_custom_endpoint", {
       app: appId,
-      provider_id: providerId,
+      providerId: providerId,
       url,
     });
   },
@@ -53,7 +53,7 @@ export const vscodeApi = {
   ): Promise<void> {
     await invoke("remove_custom_endpoint", {
       app: appId,
-      provider_id: providerId,
+      providerId: providerId,
       url,
     });
   },
@@ -65,28 +65,25 @@ export const vscodeApi = {
   ): Promise<void> {
     await invoke("update_endpoint_last_used", {
       app: appId,
-      provider_id: providerId,
+      providerId: providerId,
       url,
     });
   },
 
   async exportConfigToFile(filePath: string) {
     return await invoke("export_config_to_file", {
-      file_path: filePath,
       filePath,
     });
   },
 
   async importConfigFromFile(filePath: string) {
     return await invoke("import_config_from_file", {
-      file_path: filePath,
       filePath,
     });
   },
 
   async saveFileDialog(defaultName: string): Promise<string | null> {
     return await invoke("save_file_dialog", {
-      default_name: defaultName,
       defaultName,
     });
   },
diff --git a/tests/components/McpFormModal.test.tsx b/tests/components/McpFormModal.test.tsx
index 367815e..18000ca 100644
--- a/tests/components/McpFormModal.test.tsx
+++ b/tests/components/McpFormModal.test.tsx
@@ -19,6 +19,8 @@ vi.mock("react-i18next", () => ({
     t: (key: string, params?: Record<string, unknown>) =>
       params ? `${key}:${JSON.stringify(params)}` : key,
   }),
+  // 提供 initReactI18next 以兼容 i18n 初始化路径
+  initReactI18next: { type: "3rdParty", init: () => {} },
 }));
 
 vi.mock("@/config/mcpPresets", () => ({
diff --git a/tests/msw/handlers.ts b/tests/msw/handlers.ts
index fe1b6a2..2b85dd4 100644
--- a/tests/msw/handlers.ts
+++ b/tests/msw/handlers.ts
@@ -169,13 +169,21 @@ export const handlers = [
   http.post(`${TAURI_ENDPOINT}/is_portable_mode`, () => success(false)),
 
   http.post(`${TAURI_ENDPOINT}/select_config_directory`, async ({ request }) => {
-    const { default_path } = await withJson<{ default_path?: string }>(request);
-    return success(default_path ? `${default_path}/picked` : "/mock/selected-dir");
+    const { defaultPath, default_path } = await withJson<{
+      defaultPath?: string;
+      default_path?: string;
+    }>(request);
+    const initial = defaultPath ?? default_path;
+    return success(initial ? `${initial}/picked` : "/mock/selected-dir");
   }),
 
   http.post(`${TAURI_ENDPOINT}/pick_directory`, async ({ request }) => {
-    const { default_path } = await withJson<{ default_path?: string }>(request);
-    return success(default_path ? `${default_path}/picked` : "/mock/selected-dir");
+    const { defaultPath, default_path } = await withJson<{
+      defaultPath?: string;
+      default_path?: string;
+    }>(request);
+    const initial = defaultPath ?? default_path;
+    return success(initial ? `${initial}/picked` : "/mock/selected-dir");
   }),
 
   http.post(`${TAURI_ENDPOINT}/open_file_dialog`, () =>